Locomotive-boiler furnace.



P. F. GAINES. Y

LOOOMOTIVE BOILER FURNACE.

APPLICATION FILED AUG. 28, 1909.

Patented Dec. 21, 1909.

2 SHEETS-SHEET 1.

WITNESSES 'F. P. GAINBS. LOGOMOTIVE BOILER FURNACE. APPLICATION FILEDAUG. 28, 1909.

Patented Dec. 21, 1909.

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1 '0' all-whom it may concern;

BeltlillOWH that I FREDERICK F. Gnixns,

. of-Savannah, in the county of Chatham and,

Patent. of the' United 'States'No. 234,157, lfi,

.bta'te of'Georgia, haveinvented a certain new and usefulImprovement inLocomotive- .Boiler Furnac'es, of which improvement the following is aspecification.

My present invention relates to locomotive boiler furnaces 'of the typein which the spacew'i-thin the. firebox is divided, by a vertical bridgewall, into a rear fire chamber andaforward'combustion chamber, aninstance of which is exemplified in Letters granted and issued to meunder date of September 14, 1909.

The object of my inventionis to facilitate the free steaming of alocomotive boiler having 'a furnace of the above type, as well as toincrease the life of the grate bars used therein." I 7 The improvementclaimed is hereinafter fully set forth.

is av vertical longitu inal central section through the firebox and theadjoinin portion of the. waist of locomotive boiler,

illustrating-an application of my invention,

and; Figs. 2 and-3,, vertical transversesections through .tl1firebox, onthe lines a a and'b b, respectivelyot Fig. 1.

- My invention isherein exemplifiedas applied in a locomotive boiler ofthe type .shown in Letters Patent No. 934,157 aforesaid, that is to say,having a Wide firebox, 1, connected to a waist, 2, throu h which aplurality'of. fines, 3, extend irom a flue sheet, 4, to a smoke box'(not shown); at the forwardend of the Waist-Z. The rear Water wall ofthe firebox is provided with one or -moreifiring openings, controlled bysuitable doors in the usual manner, two of said openings belng used-1nth s case, and the flanges,

"5", around one of -them which is out of the longitudinal central planeof section, being shown in Fig. 1. 'The interior of the firebox is, asin Letters Patent No; 934,157 More said, divided bya vertical-bridgewall, 7, of

. firebrick or .other 'suitable'. refractory mate;

rial, supported ona transverse bearer, 8, into afir'e chamber,A,'extending from'the rear side of the bridge Wall to the rear of thefirebox, and a. combustion chamber, B, extending from the frontside ofthe bridge wall to the flue sheet, 4:. v Y

In the practice-of my present invention,

drawings:- 1* igure 1 Y I provide a plurality of grate bars, (l, of: any1 trunnion's, 6, which fit in the bearers, 6 and pass: through socketsor thimbles, l ,'.'fixed in the rear water wall of the firebox, a shortdistance above the mud ring, 1, thereof, and the middle portions of thegrate bars. rest on intermediate bearers, 6, fixednto the sideportionsof the mud ring. The grate bars I I PatentedDo;"21,"1909. Applicationfiled August28, 1909. Seria1No.514,986.

may be rocked or shaken by bars applied to squared portions on the outerendsot their rear trunmons, in order toclear them ofcinders whendesired. I also provide a plu-' 'rality of open ended water grate tubes,12, which are formed of double extra strong pipe, preferably about 2inches in diameter, and are securechat their front and rear ends, in theflue sheetyl, and the back sheet,

4, of the inside firebox, respectively, said;

water grate tubes passing through the bearer, 8, of the bridge wall, andunder, and

entirely clear of, the bottom plate, 10,-of the combustion chamber, B.As shown in Fig.

1, both .the grate bars, (3, and" water grate tubes, 12,:1re downwardlyinclined trom the rear to the front ot'the fire box, and :u'o'

relatively alternated in position, each grate bar being interposedbetween two water grate tubes. In the instance shown, one of the watergrate tubes is located in the lon-.

gitudin'al central plane of the firebox, and consequently the combustionchamber, B, is provided with two discharge hoppers, 11, each having amovable slide or door, 11. It will, however,' be obviousthat a singledischarge hopper willonlybe necessary if the middle water grate tubesare located on op-v posite sides of the longitudinal central plane.

I have found in practice that the free steaming qualities of alocomotive boiler of the type towhich my invention relates arematerially promoted by the. use of my improvement. The alternated gratebarsa'nd water grate tubes present a grate surfacewhich is suitable forthe supportof the fuel and the proper admission of air thereto,

and which maybe readily cleared of cinders' by rocking the grate bars.The water grate tubes, the locatlon of which is such as not to reduce orinterfere with the combustion chamber space, maintain a-constantclrculafthe firebox, and as the water therein is heatt-ion of water inthe boiler, as the colder Water naturally tends to pass to the lowestpoint, whlch is in the front water wall of ed, it rises and colder-watertakes its place.

vThe interposition of the grate tubes between i thevgrate bars has thefurther advantage of increasing the life of the latter by'preventingthem from rapidly burning out, as they are found to do. when forming theentire 7 supporting chamber- "I claim as my invention and desire to se-.

surface of the fuel in thenfire cure by Letters Patent:

The comblnation, w th a locomotiveboiler firebox, of a bearer extendlngacross the firebox near the bottom thereof and attached at its endsthereto, a bridge wall of refractory material supported on said bearerand dividingthe interior of'the firebox into a rear fire chamber spaceand a forward combustion chamber space, a bar grate extendinglongitudinally at the bottom of the firechamber space, and a pluralityof water grate tubes, alternated in position with the bars of the grateand extending from the.

' rear to the front water wall of the firebox and below the combustionchamber space.

2, The combination, with a locomotive boiler firebox, of a bearerextending across the firebox near the bottom thereof and. at-

tached at its ends thereto, a bridge wall of. refractory materialsupported on said bearer and dividing the interior-of the firebox intoa-rear fire chamber space and a forward combustion chamber space, aplurality of rate bars extending from the bridge wall to the rear wallofthe'firebox, and a plurality of water grate tubes, alternated inposition with the ra te bars and extending from the rear to front waterwall of the firebox and be w the combustion c amber space.

3, The combination, 'with a locomotive boiler firebox, of a bearerextending across the firebox near the bottom thereof and attached at itsends thereto, a bridge wall of refractory material supported onsaidbearer and dividing the interior of the firebox into a rear firechamber space and a forward combustion chamber space, a plurality ofrocking or vibratable' grate bars extending from the bridge wall to therear water wall of the firebox, and a plurality of water'gratetubes,"alternated in position with the grate bars and extending from therear to the front-- water wall of the firebox and below the combustionchamber space.

4. The combination, wlth a locomotive boiler firebox, ofa bearerextending across the firebox near the-bottom thereof and attached-at itsends thereto, a bridge wall of refractory material supported on saidbearer and dividing the interior of the fireboxinto a rear fire chamberspace and aforward combustion chamber space, sockets or thimbles fixedin the rear water wall of the firebox, grate bar bearers fixed to thebridge wall bearer, a plurality of grate b'ars havingend trunnionssupported on the grate bearers and in the sockets or thimbles, and aplurality of water grate tubes, alternated in extending.

